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1.
叙词表转换为Ontology的研究 总被引：21，自引：3，他引：21
Ontology为需要共享某一领域信息的研究人员提供了通用的词表，而这正是传统的叙词表在信息检索中所起的作用。本文对叙词表向OntologY转换进行了综合性介绍，分别介绍了Ontology定义及作用、叙词表和Ontology的联系、Ontology所包含的内容和建立步骤以及叙词表转换为Ontology的研究和进展，最后结合一个具体实例加以阐述。 相似文献
2.
国内图书馆学情报学领域关于Ontology的研究综述 总被引：3，自引：1，他引：3
Ontology作为一种能在语义和知识层次上描述概念体系的有效工具，是知识工程及其相关领域的研究热点之一，在图书馆学情报学领域也得到了相当广泛的关注。本文简要介绍了图书馆学情报学领域的研究现状．包括Ontology与分类法、叙词表、元数据的关系，Ontology在数字图书馆、文献标引、信息检索方面的应用等。 相似文献
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对两种知识组织系统--叙词表与Ontology的比较研究 总被引：8，自引：0，他引：8
本文列举了一些知识组织系统,论述了叙词表与Ontology两种知识组织系统的相关理论,最后对叙词表与Ontology进行了比较分析,对两者的区别与联系进行了阐述。 相似文献
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文章从语义信息检索角度,分析了叙词表编制标准的重要性,以3个叙词表编制标准为研究对象,从词间关系分类角度对比分析了国际叙词表编制标准、中国叙词表编制标准和美国叙词表编制标准之间存在的异同,在此基础上,总结出中国叙词表编制标准存在的不足,提出了我国叙词表编制标准重新修订的建议. 相似文献
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从叙词表到Ontology 总被引：6，自引：0，他引：6
文章阐述了传统叙词表以及概念集,(Ontology)的相关概念和原理,在此基础上对二者进行了比较分析,构建概念集是实现语义网的基础,指出叙词表的发展趋势就是概念集。 相似文献
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基于航天叙词表的领域本体半自动化构建研究 总被引：2，自引：0，他引：2
文章在基于叙词表的本体构建方法基础上,从该方法本体构建现状研究入手,针对基于叙词表向领域本体转化的一系列问题,如叙词表词间一些不确定关系表示,构建过程的OWL关系表示的细化以及叙词表转化为本体后的维护扩展等,对本体和叙词表的相关知识进行论述,并利用OWL语言来表示和描述叙词表的叙词及词间的相关关系,提出从叙词表向本体转化的理论实践方法。 相似文献
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语义网环境中的叙词表实例研究——利用SKOS构造机器可理解的知识组织体系 总被引：1，自引：0，他引：1
本文对叙词表在知识组织体系知识层面与语义网核心Ontology结合，阐述了叙词表表达知识概念与语义关系的能力为语义网建设提供资源组织基础；在描述层面利用SKOS对叙词表进行实例改造，对叙词语义关系可视化表示以及对网页进行主题标引。最后指出SKOS为知识组织体系提供一套简单，灵活，可扩展的机器可理解的描述和转化机制。 相似文献
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一种基于本体的叙词语义描述方法 总被引：2，自引：0，他引：2
本体技术作为一种能在语义和知识层次上描述概念体系的有效工具，在数字图书馆得到了广泛的关注；利用叙词表构建本体也已成为数字图书馆领域研究的热点之一。本文根据《中国分类主题词表》的分类与编排方法，讨论了叙词表的语义关系，针对叙词表的缺陷，给出了基于叙词的本体描述方法，并且提供了基于本体的多义词、同义词、惯用词等的处理。 相似文献
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本文分析叙词表、分类法与分布式本体概念的内涵与外延及各自的属性，探讨了三者相互关系，在此基础上提出了建立基于叙词表、分类法与分布式本体模型的设想。这种分布式本体是在语义和知识层次上描述信息系统的概念模型建模工具。通过对这种分布式本体的机理与实现方法的分析与总结得出结论：基于叙词表、分类法构建的分布式本体是在分布异构的网络环境下探索知识发现、知识组织、知识检索、知识服务的有效途径，是智能网络服务的必然归宿。 相似文献
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A research group led by Prof. ZHAI Qiwei from the Institute for Nutritional Sciences under the CAS Shanghai Institutes for Biological Sciences has discovered that even relatively low doses of resveratrol-a chemical found in the skins of red grapes in red wine-can improve the sensitivity of mice to the hormone insulin according to a report in the October issue of Cell Metabolism.…… 《中国科学院院刊(英文版)》2008,22(1):14-15
Aresearch group led by Prof. ZHAI Qiwei from the Institute for Nutritional Sciences under the CAS Shanghai Institutes for Biological Sciences has discovered that even relatively low doses of resveratrol--a chemical found in the skins of red grapes and in red wine--can improve the sensitivity of mice to the hormone insulin, according to a report in the October,2007 issue of Cell Metabolism. As insulin resistance is often characterized as the most critical factor contributing to the development of Type 2 diabetes, the findings“provide a potential new therapeutic approach for preventing or treating” both conditions, the researchers said. 相似文献
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Marjorie Armstrong-Stassen Margaret Landstrom Ramona Lumpkin 《The Information Society》1998,14(2):153-164
This study examined how students who had no prior experience with videoconferencing would react to the use of videoconferencing as an instructional medium. Students enrolled in seven different courses completed a questionnaire at the beginning of the semester and again at the end of the semester. Students at the origination and remote sites did not differ in their reactions toward videoconferencing but there was a significant difference for gender. Women reacted less favorably to videoconferencing. Compared to the beginning of the semester, students reported significantly less positive attitudes toward taking a course through videoconferencing at the end of the semester. There were no significant differences in students' attitudes toward videoconferencing across courses at the beginning of the semester but there were significant differences across the courses at the end of the semester. The results suggest the need for better preparation for both students and instructors. 相似文献
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A joint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology his co-workers from Norway US Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells suggesting that China's projected climate warming could decrease the pest's numbers. The study was published in Proceedings of the National Academy of Sciences on September .…… 《中国科学院院刊(英文版)》2008,22(1):6-7
Ajoint study by Prof. ZHANG Zhibin from the CAS Institute of Zoology and his co-workers from Norway, US and Swiss have indicated that historical outbreaks of migratory locusts in China were associated with cold spells, suggesting that China＇s projected climate warming could decrease the pest＇s numbers. The study was published in Proceedings of theNational Academy of Sciences on 17 September, 2007. 相似文献
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Caroline Haythornthwaite 《The Information Society》2001,17(3):211-226
A computer-mediated group is a complex entity whose members exchange many types of information via multiple means of communication in pursuit of goals specific to their environment. Over time, they coordinate technical features of media with locally enacted use to achieve a viable working arrangement. To explore this complex interaction, a case study is presented of the social networks of interactions and media use among members of a class of computer-supported distance learners. Results show how group structures associated with project teams dominated who communicated with whom, about what, and via which media over the term, and how media came to occupy their own communication niches: Webboard for diffuse class-wide communication; Internet Relay Chat more to named others but still for general communication across the class; and e-mail primarily for intrateam communication. Face-to-face interaction, occurring only during a short on-campus session, appears to have had a catalytic effect on social and emotional exchanges. Results suggest the need to structure exchanges to balance class-wide sharing of ideas with subgroup interactions that facilitate project completion, and to provide media that support these two modes of interaction. 相似文献
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《中国科学院院刊(英文版)》2008,22(1):2-3
CAS should stick to the principle of rendering service to, and giving impetus for, the development of China＇s science enterprise by making S＆T innovations, said CAS President LU Yongxiang. The CAS president made the remarks in a recent talk to communicate the gist of the winter session of the Party＇s Leading-member Group at CAS, which was held from 7 to 11 January in Beijing. 相似文献
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Active biological molecules functional structures can be fabricated into a bio-mimetic system by using molecular assembly method. Such materials can be used for the drug delivery disease diagnosis therapy new nanodevice construction.…… 《中国科学院院刊(英文版)》2008,22(1):22-22
Active biological molecules and functional structures can be fabricated into a bio-mimetic system by using molecular assembly method. Such materials can be used for the drug delivery, disease diagnosis and therapy, and new nanodevice construction. 相似文献
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《中国科学院院刊(英文版)》2008,22(1)
With great care, Dr. ZHOU Zhonghe takes out a package wrapped by cotton tissue from a drawer and says: "This is the gem of our collections: the fossil of a bird that lived 125 million years ago!" Then, pointing at a tiny mound, he explains: "Look, this is the claw and that is the head. It was in the egg shell and ready to hatch ... The species fell into a family of waterside inhabitants." 相似文献
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Electronic data interchange (EDI) provides means for interorganizational communication, creates network externalities, requires an advanced information technology (IT) infrastructure, and relies on standards. In the diffusion of such innovations, institutional involvement is imperative. Such institutions contain governmental agencies, national and global standardization organizations, local government, and nonprofit private organizations like industry associations. The last type of organizations we call intermediating institutions. They intermediate or coordinate ("inscribe") the activities of a group of would-be adopters. Unfortunately, little is known of how these organizations shape the EDI diffusion trajectory. In this article we examine one specific type of intermediating organizations?industry associations?and how they advanced the EDI diffusion process in the grocery sectors of Hong Kong, Denmark and Finland. We identify six institutional measures, placed into a matrix formed by the mode of involvement (influence vs. regulation) and the type of diffusion force (supply push vs. demand pull), that can be mobilized to further the EDI diffusion. Industry associations were found to be active users of all these measures to varying degrees. Their role was critical especially in knowledge building, knowledge deployment, and standard setting. Furthermore, institutional involvement varied due to policy and cultural contingencies and power dependencies. 相似文献
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Leah A. Lievrouw 《The Information Society》2000,16(2):155-159
This essay focuses on universal service and the Internet as means to support social and political participation. The emphasis on access to telecommunications systems in conventional approaches to universal service is contrasted with access to content. A model of the information environment is described that accounts for the roles of content and conduit, both of which are necessary conditions to achieve true access. A method is outlined for employing information indicators to observe or measure the information environment. 相似文献
20.
Puay Tang 《The Information Society》1998,14(1):19-31
The increasing prospects of digital piracy has prompted the perceived need by electronic publishers to adopt technical systems of protection, and governments to reform their copyright laws. This article is a preliminary study of the management of intellectual property by electronic publishers, defined as those involved in the production of online databases, and CD-ROMs. It focuses on three main issues: (1) how electronic publishers view the increasing threat of piracy; (2) the methods of protection employed to protect intellectual property in digital format; and (3) the importance of technological protection of intellectual property in electronic publications. The analysis is based on a sample of 23 UK electronic publishers. The interviews revealed an interesting assortment of protection methods and did not show that technological protection was a preferred way. Instead, the means of protection, in addition to copyright law, comprised niche markets, pricing, trust, bad publicity, and nontechnical and technical means. 相似文献